We just hit 40,000 EV miles solar powered EV miles on our 2013 Chevy Volt.
We have a total 49,000 miles with only one oil change need so far.
Here are all the real world numbers
Her is a link to just my car.
Volt Stats: Details for Volt #2013-02615 (Flynn's Light Runner)
This site has lost of Volts posting their numbers with OnStar.
Volt Stats! Tracking real world usage of Chevy Volts in the wild...